发明名称 |
IMPROVED MELT EXTRUSION PROCESSES AND FILMS PRODUCED THEREBY |
摘要 |
The invention relates to a process for melt extruding a film layer of a thermoplastic olefin which comprises extruding the film having physical characteristics under process conditions selected by reference to the Draw ratio Dr and the Aspect ratio A such that draw resonance is avoided in which in addition the process conditions are defined by reference to the Deborah number such that the molten polymer is extruded at a Draw ratio of at least 30 in a high elasticity region at a .lambda.c value of characteristic time as defined herein of from 0.001 to 0.6 s, a Deborah number as defined herein in excess of 0.005 and an A value as defined herein lower than 0.8. Narrower ranges of these parameters may be defined for application of the invention to different polymer types. |
申请公布号 |
CA2253255(A1) |
申请公布日期 |
1997.12.04 |
申请号 |
CA19972253255 |
申请日期 |
1997.05.28 |
申请人 |
EXXON CHEMICAL PATENTS INC. |
发明人 |
AGASSANT, JEAN-FRANCOIS;DEMAY, YVES;OHLSSON, STEFAN B.;SILAGY, DAVID;CHAMBON, FRANCOIS H. |
分类号 |
B29C47/00;B29C47/88;B29C55/00;B29C55/02 |
主分类号 |
B29C47/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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